Type-writing machine.



No. 859,308 PATENTED JULY 9, 1907.

J. R. MAOGUFPIEP TYPE WRITING MACHINE.

APPLICATION FILED NOV. 28, 1905.

WITNESSES.

UNITED STATES PATENT OFFICE.

JAMES R. MACGUFFIE, on NE roan, Y., Assion'oa '10 ROYAL TYPEWRITER COMPANY or HOBQKEN. nnwnsnsnr A ooa-roimrIoN-or NEW JERSEY.

TYPE-WRITING MACHINE.

Application filed November 28,

Specification of LettersPatent.

Patented July 9, 1907. 1905. Serial No. 239,389.

anism adapted at will to move the carriage in reverse.

l direction step by step one or more points, or printing spaces, to enable an operator to make corrections or insertions without recourse to the ordinary practice of moving the platen back by hand. I The invention resides in certain structural 'leatnres hereinafter'described, many devices or this purpose having heretofore been proposed.

In the accompanying drawing, Figure 1 is a transverse section through a writing machine taken in' lront of and adjacent the back frame plate: and Fig. 2, a (letail perspective view of the principal parts of the device. 0 a is the back plate of the machine and b side plates or bars appearing in transverse section.

0 is the ordinary carriage rack bar meshing with the usual pinion d on the escapement-wheel shaft, the bearing of which is in a brackete mounted upon the 7 frame. i v

A pivoted key lever f, preferably located at the left hand side of the machine, and intended to be extended to the key board in which it will have an appropriate finger piece, is connected toward its rear end and in front of its pivot, by a link 9 with the horizontal arm.

of a bell crank lever h pivoted in a bracket on the frame and having its vertical arm connected'by a link 'i with the lower end of a vertically disposed lever j pivoted intermediate its ends. concentrically with another lever k which is pivoted ,upon the frame. The upper end. of the lever k extends beyond lever j and has pivoted in it a pawl m 40 in the form of a bell crank lever, its toothed arm extending substantially horizontally beneath the ack and its other arm extending downwardly beyond the upper end of lever j with which it has pivoted connection at n. Theaxis j of lever k is preferably vertically below the axis of the back feed pawl m, the intention being that as the lever moves to the right to set back .the carriage no lifting action of the pawl upon the rack will occur.

A coiled spring 0 is attached to the lower end of lever k and to the frame and by its own reaction tends to hold the parts in normal position indicated by the full lines in Fig. 1. A stop it on lever k limits the movement of the pawl ina direction away from the rack 'or elsewhere as may be desired.

The lever j is pivotedv while a similar stop E on this lever, on the opposite side of the downwardly extendingpart of the pawl,

arrests upward movement of the pawl after it has properly engaged the rack. At the right hand edge of the upper part of lever is, it is cut away, forming a horizontal surface 7), and an upwardly extending surface g.

Thenormal retracted position is determined by abutment of surface 10 against a stop-r011 the frame: and

'when actuated iroinnormal position its movement to the right, as viewed in Fig. 1, is arrested by surface q abutting against stop r. .The lever j and pawl m may be held in normal and inoperative position indi- 6 5 cated in full lines in both Figs. 1 and 2 by a spring applied at any appropriate point, as at the key lever, which is common practice in machines of this class, I have shown such I prefer to use such depend upon gravity oi the a springs applied to the key lever. a spring rather than to various parts.

When the key lever is depressed, link 1' moving to the left, as viewed in Fig. 1, causes pawl m to be positively rocked (through the action of lever j and pivot connection n) its toothed end passing upwardly into proper engagement with the rack when it is arrested by the stop it. Continued depression of the key lever overcomesthe tension of spring 0 and since levers j, k, are now. locked to move together at stop t the toothed end of the pawl is carried to the right moving the car- 7 riage back one letter space when the action is arrested by surface q abutting against stop 1'. When the key 1s released, the parts, oi course, immediately return to normal position. Repeated actuation of the key results in successive reverse or back feed steps oi the carriage.

I claim as my invention:

1. hack food device for a typewriting machine. 130D l l' comhiinii'ion oi an upright l-'\'9l'.l.ll\'llii'(l to the 9 frame. a buck i'cod pawl pii'oli-u in the uppor end of the lever'and having a toothed part rtdnpi'od to engage the rack and a downwardly cxlcnding part. a second upright lttVlli pivotcd conccntrically to tho first nnmcdlcvcr. a pivotal connection hctwccn its uppor cnd and tho downwardly extending part of the pawl. opcraring' moons ap pliod to the lower end of tho sccon-d inontioncd lever, stops on the pawl lcvor for limiting tho inovcnicnl; of the pawl in both dii'cciions and stop dcviccs for limiting the niovc input of the first nicntioncd Icvor in both directions. 2. in a back food dovicc for typowriring machines ihc combination oi the cnrringc ruck, a vcriicnlly .disposcd lever pivotod ini'oi'inodinle its cnds, a pawl pivoied .in the uppcr end there-oi in propcr relation in tho rack and having a horizontally disposcd iooIln-d arm and a downwardly extending :n-ni. limiting stops npo n the lever 'on both sides uf'lhc downwardly cxtcnding portion of the pawl. a sccond lever pivotcd coin'ontrically to the first one. a pivotal conncction botwccn its upper cnd nnd'tlie downwardly c tonding part of the pnwl an operating device applied to the lower end of such second lever and stop devices for limiting the movement of the first named lever in either direction.

' 3. 1n a back feed device for typewriting machines; the

combination with the carriage rack,-of a lever pivoted upon the frame, a back teed pawl'pivoted upon the lever, a second lever, 21 pivoted connection between it end the back feed pawl, stops on the-first named lever for limiting the movement'of the second named lever relatively thereupon the frame, a back feed pawl pivoted iipon the lever,

stops upon the lever for limiting thev movement of the pawl in either direction, a second lever, a pivotal connection between it and the back feed pawl,'stop devices for limiting the-movement of the first nemeddever'ineither direction and operating means applied to the second mentioned lever. I

In testimony whereof haveherennto subscribed D337 JAMES" R. MACGUFFIE.

Witnesses:

L. F. BROWNING, EDWARD C. DAviosorL 

